No, practically nothing will work from x64 pe. It doesn't include syswow.
You need to make a separate x86 wim and include any apps you want in that.
You then have 2 wims.
The x64 wim will be called boot.wim by default - you need to rename it REC64.wim is fine.
The new wim you make by mounting the x86 boot.wim and adding in your apps. should still keep the name boot.wim
Put both those .wims inside the sources folder of x86 windows files.
Add an entry for the REC64.wim to the bcd store in the boot folder of the x86 files.
Adding the entry is explained here: creating a 2 OS thumb drive
To keep the size down , you can delete everything from the x86 files\sources folder except
the 2 wims.
Create an iso. Boot it and you can choose either the "Windows Setup" option , which is the x86 boot.wim with your programs inside, or the REC64.wim.
Obviously, when creating the boot menu entries, you can give them any description you like - that is what you see on the boot menu screen.